Breeding for Horizontal Resistance

Breeding for horizontal resistance is a process almost identical to this screening of winter cereals, except that crop parasites, rather than frost, are used to kill off the undesirable, susceptible seedlings. Breeding for horizontal resistance involves recurrent mass selection and it must follow these simple rules:

Screen for high yield, on the grounds that only resistant plants yield well in the presence of parasites.

Use simple inoculation techniques to ensure that the high yield is due to resistance, and not to chance escape from infection or infestation.

Use the one-pathotype technique (see 7.5) to ensure that the resistance is horizontal and not vertical.

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